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One way you could check the cables is to open the back find the R, G, and B coax lines and jumper the center conductors together with something like 50 ohm resistors. If the picture becomes monochrome and you have decent light from all colors then it's the cable. You could also do continuity checks on the cable. On the video coax lines if you have a capacitance meter that reads down into the pF range you can figure out where the break is on the coax by measuring capacitance on both ends (make sure both ends are unplugged from everything else) and using the ratio of capacitances to figure out how far down the line the break is.
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